Remove GYP files in breakpad, build, and tools.

tools/android/push_apps_to_background/push_apps_to_background.gyp

Index: tools/android/push_apps_to_background/push_apps_to_background.gyp
diff --git a/tools/android/push_apps_to_background/push_apps_to_background.gyp b/tools/android/push_apps_to_background/push_apps_to_background.gyp
deleted file mode 100644
index 25fca1f6ed7628d5503948f553324d7770a23a73..0000000000000000000000000000000000000000
--- a/tools/android/push_apps_to_background/push_apps_to_background.gyp
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-{
-  'targets': [
-    # GN: //tools/android/push_apps_to_background:push_apps_to_background_apk
-    {
-      'target_name': 'push_apps_to_background_apk',
-      'type': 'none',
-      'variables': {
-        'apk_name': 'PushAppsToBackground',
-        'java_in_dir': '.',
-        'resource_dir': 'res',
-        'android_manifest_path': 'AndroidManifest.xml',
-      },
-      'includes': [
-        '../../../build/java_apk.gypi',
-      ],
-    },
-  ],
-}